Canon Anelva Corporation

Katsuhiro Suzuki

Shinya Hasegawa

Toshikazu Nakazawa

Akihiro Egami

The inventors of this invention conducted a test and found out that to prevent peel-off of an adherent film, it is not of essential importance to set the radius of curvature equal to or larger than a predetermined threshold. The inventors of the present invention also found out that peel-off of an adherent film occurs in the region in which the curvature of a shield changes and is less likely to occur when the change in curvature of the shield is small. Accordingly, the key to the problem is the magnitude of a change in curvature of the shield, so changing the curvature stepwise makes it possible to suppress a large change in curvature, and thus to prevent peel-off of an adherent film free from any disadvantages such as deterioration in film thickness distribution, which may occur due to an increase in size of the shield.

Growing community of inventors

Fuchu, Japan

Katsuhiro Suzuki